ElggTempDiskFilestore.php

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<?php
class ElggTempDiskFilestore extends \ElggDiskFilestore {
    
    protected $unique_sub_dir;
    
    public function __construct($directory_root = '') {
        
        if (!$directory_root) {
            $directory_root = rtrim(sys_get_temp_dir(), DIRECTORY_SEPARATOR) . '/';
        }
        
        $this->unique_sub_dir = uniqid() . '/';
        
        parent::__construct($directory_root);
    }

    public function getFilenameOnFilestore(\ElggFile $file) {
        
        $filename = $file->getFilename();
        if (!$filename) {
            return '';
        }

        return $this->dir_root . $this->unique_sub_dir . $file->getFilename();
    }
    
    public function getParameters() {
        $params = parent::getParameters();
        $params['unique_sub_dir'] = $this->unique_sub_dir;
        
        return $params;
    }

    public function setParameters(array $parameters) {
        
        if (isset($parameters['unique_sub_dir'])) {
            $this->unique_sub_dir = $parameters['unique_sub_dir'];
        }

        return parent::setParameters($parameters);
    }
}